four score and seven years ago

Eighty-seven years ago. (A "score" is a set of 20 items.) The iconic first line of US President Abraham Lincoln's Gettysburg Address, the speech he delivered at the dedication of the national cemetery in Gettysburg, Pennsylvania. Lincoln gave this speech in 1863—87 years after 1776, the year of the founding of the United States. Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.